CSV文件给出的字符串

Question

我csv文件看起来像：

"(-0.16192019, -0.007456851, 0.08841695)","(-0.10439591, 0.024501082, 0.12783173)","(-0.05965481, 0.049002163, 0.12144014)",... 

，但我不希望引号。

我写的功能为：

for j in range(len(sensor_data)): 
    with open(names[j] + "P" + str(i) + ".csv", "wb") as f: 
     writer = csv.writer(f) 
     writer.writerows(sensor_data[j]) 

我sensor_data[j]是这样的：

gyro.append((float(merge.iloc[j, 2]), float(merge.iloc[j, 3]), float(merge.iloc[j, 4]))) if merge.iloc[j, 0] == 'Gyroscope' \ 
      else acc.append((float(merge.iloc[j, 2]), float(merge.iloc[j, 3]), float(merge.iloc[j, 4]))) 

为什么没有打印出花车，而不是字符串的元组的元组？

merge = pd.read_csv(final_user_study_path + "/P" + str(i) + "/DataCollection/data/merge.csv") 

合并的样子：

Gyroscope,50958,-0.3387541,0.014913702,0.05965481 
Gyroscope,50978,-0.23009712,0.03621899,0.044741105 
LinearAcceleration,50979,-0.09891046,0.119261175,-0.108936176 
Gyroscope,50998,-0.1768339,0.066046394,0.040480047 
LinearAcceleration,50999,-0.0863409,0.18240824,-0.07152677 

类型所有这些值都是字符串。

我想：

(-0.16192019, -0.007456851, 0.08841695),(-0.10439591, 0.024501082, 0.12783173),(-0.05965481, 0.049002163, 0.12144014),... 

Answer 1

要加上引号在需要的时候停止csv.writer()（因为它发现在单元格的分隔符），加上quoting参数如下：

writer = csv.writer(f, quoting=csv.QUOTE_NONE) 

见CSV文档：csv.QUOTE_NONE

这将是更好的解开元组，使他们各自正确地得到自己的单元格w没有任何额外的括号。这可能会使用itertools.chain.from_iterable()来完成，以将所有元组合并到一个列表中。例如：

from itertools import chain 

row = [(-0.16192019, -0.007456851, 0.08841695), (-0.10439591, 0.024501082, 0.12783173), (-0.05965481, 0.049002163, 0.12144014)] 

print row 
print list(chain.from_iterable(row)) 

这将显示：

[(-0.16192019, -0.007456851, 0.08841695), (-0.10439591, 0.024501082, 0.12783173), (-0.05965481, 0.049002163, 0.12144014)] 
[-0.16192019, -0.007456851, 0.08841695, -0.10439591, 0.024501082, 0.12783173, -0.05965481, 0.049002163, 0.12144014] 

正如你所看到的，第二行显示的是所有的记录都被夷为平地到一个列表。